CVE-2021-4226

RSFirewall < 1.1.25 - IP Block Bypass

RSFirewall tries to identify the original IP address by looking at different HTTP headers. A bypass is possible due to the way it is implemented.

Affected

RSFirewall!

CVSS v3.1 NVD

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.55% chance of exploitation in the next 30 days, 45th percentile

Published

2022-12-15

Updated

2025-04-21

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/c0ed80c8-ebbf-4ed9-b02f-31660097c352

References

• CVE Record
• NVD entry